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  • Question
  • Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor

    Reason (R): Transistors are manufactured in very high voltage and current ratings.


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. A is wrong but R is correct

  • Correct Answer
  • A is correct but R is wrong 


  • Power Electronics problems


    Search Results


    • 1. In load commutated chopper, the commutating element

    • Options
    • A. is capacitor
    • B. is capacitor and inductor
    • C. is capacitor, inductor and auxiliary thyristor
    • D. any of the above depending on load
    • Discuss
    • 2. In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be

    • Options
    • A. less than mechanical or thermal time constant of the system
    • B. more than the mechanical or thermal time constant of the system
    • C. more or less than the mechanical or thermal time constant
    • D. very high
    • Discuss
    • 3. Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W

      Reason (R): Heat sinks of thyristors are generally made of aluminium.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
    • Discuss
    • 4. A chopper cannot be line commutated.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. Which converter is used in HVDC transmission?

    • Options
    • A. 3 pulse
    • B. 6 pulse
    • C. 12 pulse
    • D. 24 pulse
    • Discuss
    • 6. The symbol in figure is for

    • Options
    • A. SUS
    • B. SBS
    • C. SCS
    • D. None of the above
    • Discuss
    • 7. In the circuit of figure, the waveshape of load current when thyristor conducting is

    • Options
    • A. constant
    • B. increasing exponentially
    • C. decreasing exponentially
    • D. either (b) or (c)
    • Discuss
    • 8. An n pulse rectifier is fed by a source having an inductance L. If load current is I0, the voltage drop due to overlap is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 9. In brushless excitation system of modern alternators, the main exciter is

    • Options
    • A. dc generator
    • B. ac generator
    • C. either dc or ac generator
    • D. induction generator
    • Discuss
    • 10. In a step down chopper using time ratio control, the input voltage is V and duty cycle is a. The load is purely resistive having resistance R. The average and rms load currents are

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss


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